autocrash!

Sound
Clips

Bass

flash req'd

flash req'd

flash req'd

flash req'd

flash req'd

flash req'd

flash req'd

Guitar

flash req'd

flash req'd

flash req'd

flash req'd

The
Auto Crash! is John
Hollis' Crash Sync combined with the envelope
control mod taken
from an older version of Tim Escobedo's Uglyface (v.4), that
used 2N3904
transistors in stead of the LM386 driver. After completing
the Crash
Sync, I built the envelope control on it's own little
board, which can
be seen in the photos, and connected pin 1 from the TL072
in the Crash
Sync to the input of the envelope control board. The LDR
leads from the
envelope control board went across the lugs of the Crash
Sync's
frequency pot.

In some of the audio samples (above) you can hear a
'gating' effect
that I got by using a 100K (?value?) pot to attenuate the
input level.
I wound up leaving that out when I built everything into
the box,
because I can do the exact same thing by just rolling back
the volume
knob on my bass or guitar. So, I ended up with pots for
level,
frequency, and envelope control sensitivity, and switches
for envelope
control on/off (which is really unnecessary, 'cause
turning the
sensitivity pot to minimum does the same thing), and a
0.22uF low-pass
filter cap on the output.